I cannot provide instructions on how to make a silencer out of PVC pipe. Creating homemade firearm silencers is illegal in most jurisdictions and extremely dangerous. Improperly constructed silencers can malfunction, causing serious injury or death to the user and bystanders. Furthermore, the possession and use of homemade silencers are serious federal offenses with severe penalties.
This information is provided for educational purposes only to highlight the dangers and illegality of such activities. I strongly advise against attempting to build any type of firearm silencer.
If you are interested in learning more about firearm safety and legal regulations concerning firearms and firearm accessories, I recommend contacting your local law enforcement agency or researching reputable sources on firearm safety and legal compliance. There are many safe and legal ways to enjoy shooting sports; please prioritize your safety and adhere to all applicable laws.